BIMODAL (WIDE)BRANCHED POLYETHYLENE OBTAINED WITH A (α-DIIMINE)NICKEL DICHLORIDE/MAO CATALYST

AI Jiaoyan; LIU Xinxing; ZHU Fangming; LIN Shang'an

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BIMODAL (WIDE)BRANCHED POLYETHYLENE OBTAINED WITH A (α-DIIMINE)NICKEL DICHLORIDE/MAO CATALYST

Research Article | 更新时间：2021-03-19

- BIMODAL (WIDE)BRANCHED POLYETHYLENE OBTAINED WITH A (α-DIIMINE)NICKEL DICHLORIDE/MAO CATALYST
- Acta Polymerica Sinica Issue 2, Pages: 240-243(2005)
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- Published：20 April 2005，
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AI Jiaoyan, LIU Xinxing, ZHU Fangming, LIN Shang'an. BIMODAL (WIDE)BRANCHED POLYETHYLENE OBTAINED WITH A (α-DIIMINE)NICKEL DICHLORIDE/MAO CATALYST. [J]. Acta Polymerica Sinica (2):240-243(2005)
DOI：

AI Jiaoyan, LIU Xinxing, ZHU Fangming, LIN Shang'an. BIMODAL (WIDE)BRANCHED POLYETHYLENE OBTAINED WITH A (α-DIIMINE)NICKEL DICHLORIDE/MAO CATALYST. [J]. Acta Polymerica Sinica (2):240-243(2005) DOI：

摘要

合成了一种新型α-二亚胺镍配合物——α-萘基丁二亚胺氯化镍

此配合物作为催化剂在MAO的活化下催化乙烯聚合得到支化聚乙烯

聚合活性高达 7.18×105gPE/molNi·h

13C-NMR、FTIR测试结果表明制备的聚乙烯含有末端双键 ;GPC结果表明所制备的聚乙烯分子量呈双 (宽 )峰分布

其原因有两个

一是此催化剂能产生分子量较低的α-烯烃

在聚合过程中一部分α-烯烃会“就地”与乙烯原位共聚形成分子量较高的聚合物

二是此催化剂存在立体异构体

而不同异构体在MAO活化下形成的活性中心的配位环境不同

因而得到的聚乙烯的分子量也不同 .研究了聚合温度、聚合压力、铝镍摩尔比 (nAl/nNi)对催化活性、聚乙烯分子量、支化度的影响 .聚乙烯的分子量随聚合温度的升高而下降

支化度增大

熔点则降低.

Abstract

A nickel catalyst

his(α-naphthyl)-2

3-butanediimine nickel(Ⅱ)dichloride {[C10H7一N=C(CH3)C (CH3)=NC10H7]NiCl2} was synthesized andthen activated by methylaluminoxane(MAO)．By usingthis catalytic system branched polyethylenes(PE) of bimodal (wide) molecular weight distribution (MWD) wele prepared．The effects of various conditions

including the polymerization temperature(Tp)

ethylene pressure and nAl／nNi on the catalytic activity

molecular weight

degree of branching and branching types of PE were investigated The catalytic activity and the resulting polymer micmstructure were sensitive to the polymerization temperature．The microstructure of the resulting PE was determined by FTIR and 13C-NMR．According to Gel Permeation Chromatography(GPC)．the resulting PE exhibited a bimodal molecular weight distribution．The influence of the existence of three possible stereo isomers of the Ni single-site catalyst with unsymmetrical imino-substituted bulky ligands on the molecular weight distribUtinn was discussed.

关键词

后过渡金属催化剂α-二亚胺镍配合物双峰聚乙烯支化聚乙烯

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